"Ojacanje" odmicnih
"Ojacanje" odmicnih
Zdravo!!
Mene zanima, ce kdo od vas ve s kerimi postopki bi ojacal povrsino odmicnih gredi ,da bi bile bolj odporne proti obrabi.Predvsem pa kje pa za koliko bi mi to naredili hehe.
Thnx
Mene zanima, ce kdo od vas ve s kerimi postopki bi ojacal povrsino odmicnih gredi ,da bi bile bolj odporne proti obrabi.Predvsem pa kje pa za koliko bi mi to naredili hehe.
Thnx
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- Pridružen: 04 Feb 2007, 23:42
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- Pawa user
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- Pridružen: 04 Feb 2007, 23:42
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http://www.stockcarscience.com/blog/index.php?cat=15
There are two issues: friction and wear, both of which can be addressed by coatings. Very thin (a tenth of a human hair’s width) coatings are deposited on the cams and/or lifters. Wear is two materials abrading each other. When the parts wear, they get smaller, they don’t contact they way they are supposed to, and they often get rougher. Friction, the resistance to motion of two things sliding past each other, costs horsepower in the engine.
Nitrides (chromium nitride and titanium nitride) are very hard ceramics that minimize wear. (Titanium nitride is the gold-colored coating you see on drill bits.) Coating a part is done by putting it in a vacuum chamber, removing most of the air molecules, then vaporizing your metal (titanium or chromium) and introducing some nitrogen. These types of coatings are often used on the parts of valves that contact the valve seats.
Friction is a second problem because engine power has to be used to overcome friction and that takes away from the power that goes to the wheels. Carbon comes in different forms. Two are graphite, which is one of the softest forms, and diamond, which is the hardest mineral known. Both are crystalline. If you make carbon amorphous-meaning that the atoms don’t have a regular arrangement-it’s called ‘diamond-like carbon’ or DLC. DLC has the best of both world-hardness and low friction. DLC has 10x less wear than titanium nitride and a lower coefficient of friction (which means its more slippery). DLC is actually a little too hard in some cases: it is fairly brittle, so it can crack if it gets hit too hard. Metal-doped DLC is not as hard, but also not as brittle. Since NASCAR engines often use ‘lofting’ (the lifter actually loses contact with the cam lobe), there’s a lot of impact when the pieces come back together.
There are two issues: friction and wear, both of which can be addressed by coatings. Very thin (a tenth of a human hair’s width) coatings are deposited on the cams and/or lifters. Wear is two materials abrading each other. When the parts wear, they get smaller, they don’t contact they way they are supposed to, and they often get rougher. Friction, the resistance to motion of two things sliding past each other, costs horsepower in the engine.
Nitrides (chromium nitride and titanium nitride) are very hard ceramics that minimize wear. (Titanium nitride is the gold-colored coating you see on drill bits.) Coating a part is done by putting it in a vacuum chamber, removing most of the air molecules, then vaporizing your metal (titanium or chromium) and introducing some nitrogen. These types of coatings are often used on the parts of valves that contact the valve seats.
Friction is a second problem because engine power has to be used to overcome friction and that takes away from the power that goes to the wheels. Carbon comes in different forms. Two are graphite, which is one of the softest forms, and diamond, which is the hardest mineral known. Both are crystalline. If you make carbon amorphous-meaning that the atoms don’t have a regular arrangement-it’s called ‘diamond-like carbon’ or DLC. DLC has the best of both world-hardness and low friction. DLC has 10x less wear than titanium nitride and a lower coefficient of friction (which means its more slippery). DLC is actually a little too hard in some cases: it is fairly brittle, so it can crack if it gets hit too hard. Metal-doped DLC is not as hard, but also not as brittle. Since NASCAR engines often use ‘lofting’ (the lifter actually loses contact with the cam lobe), there’s a lot of impact when the pieces come back together.
2 fast 2 live, 2 young 2 die
Re: "Ojacanje" odmicnih
Bom kar tule vprašal
cilinder po brušenju (zmes Al) bi prevlekel z nickel silicon carbide, mogoče kakšen pozna, kdo to slučajno počne v slo?
cilinder po brušenju (zmes Al) bi prevlekel z nickel silicon carbide, mogoče kakšen pozna, kdo to slučajno počne v slo?
Re: "Ojacanje" odmicnih
V Italiji.
http://www.pro-tuning.si/" onclick="window.open(this.href);return false;
Re: "Ojacanje" odmicnih
hm OK
bom poslal v UK
thx
bom poslal v UK
thx
Re: "Ojacanje" odmicnih
odlična ideja....ko se bom prvič na iMTju smukal bom pa še tole vprašu.
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Re: "Ojacanje" odmicnih
nekje sem prebral da bi to znal nardit tut pri tomosu, tko da mogoce lahko tut tam vprasas.
2 fast 2 live, 2 young 2 die
Re: "Ojacanje" odmicnih
malo nazaj so imeli hard crom...mogoče, bom vprašu